使用 Node.js 的 gRPC 删除 Redis 数据 (Delete)

需要三个东西：设置文件、服务器程序和客户端程序。

配置文件

redis_delete.proto
与这个文件相同
使用 Python 的 gRPC 来删除 Redis 数据（Delete）

服务器程序

#! /usr/bin/node
// ---------------------------------------------------------------
//  redis_delete_server.js
//
//                  Feb/08/2020
// ---------------------------------------------------------------
var PROTO_PATH = 'redis_delete.proto'

var grpc = require('grpc')

var protoLoader = require('@grpc/proto-loader')
var packageDefinition = protoLoader.loadSync(
    PROTO_PATH,
    {keepCase: true,
     longs: String,
     enums: String,
     defaults: true,
     oneofs: true
    });
var redis_delete_proto = grpc.loadPackageDefinition(packageDefinition).redis_delete

// ---------------------------------------------------------------
function redis_delete_proc(key_in)
{
    const redis = require ("redis")
    const client = redis.createClient (6379,'localhost')

    client.on("error", function (err)
        {
        console.log("Redis connection error to "
            + client.host + ":" + client.port + " - " + err)
        })

    client.del(key_in)

    client.quit()
}

// ---------------------------------------------------------------
function RedisDelete(call, callback) {
    console.error("*** RedisDelete ***")
    const key_in = call.request.key
    const str_out = 'RedisDelete ' + call.request.key
    console.error(str_out)
    redis_delete_proc(key_in)
    callback(null, {key: call.request.key});
}

// ---------------------------------------------------------------
function main() {
    var server = new grpc.Server()
    server.addService(redis_delete_proto.Greeter.service, {RedisDelete: RedisDelete })
    server.bind('0.0.0.0:50051', grpc.ServerCredentials.createInsecure())
    server.start()
}

// ---------------------------------------------------------------
main()
// ---------------------------------------------------------------

客户端程序

#! /usr/bin/node
// ---------------------------------------------------------------
//  redis_delete_client.js
//
//                      Feb/08/2020
// ---------------------------------------------------------------
var PROTO_PATH = 'redis_delete.proto'

var grpc = require('grpc');
var protoLoader = require('@grpc/proto-loader');
var packageDefinition = protoLoader.loadSync(
    PROTO_PATH,
    {keepCase: true,
     longs: String,
     enums: String,
     defaults: true,
     oneofs: true
    });
var redis_delete_proto = grpc.loadPackageDefinition(packageDefinition).redis_delete

// ---------------------------------------------------------------
function main() {
  var client = new redis_delete_proto.Greeter('localhost:50051',
                                       grpc.credentials.createInsecure())

  var key_in = process.argv[2]
  client.RedisDelete({key: key_in}, function(err, response) {
    console.log('key:', response.key)
  })

}

// ---------------------------------------------------------------
main()
// ---------------------------------------------------------------

启动服务器程序

export NODE_PATH=/usr/lib/node_modules
./redis_delete_server.js

执行客户端程序

$ export NODE_PATH=/usr/lib/node_modules
$ ./redis_delete_client.js t1855
key: t1855